В статье "Traffic Engineering: Local Routing Policy" описаны несколько методов манипуляции приоритетами отправки трафика через соседние автономные системы, т.е. описано как в BGP переопределять отправку трафик на определенные сети через определенный канал или управлять балансировкой трафика между каналами.

Примеры файлов конфигурации из статьи:

 
Setting the Local Preference for all routes received from a BGP neighbor

!
router bgp 60055
 neighbor 192.0.254.17 remote-as 40077
 neighbor 192.0.254.17 route-map ispa-in in
 neighbor 219.2.19.1 remote-as 50066
 neighbor 219.2.19.1 route-map ispb-in in
!
route-map ispa-in permit 10
 set local-preference 90
!
route-map ispb-in permit 10
 set local-preference 110
!


Setting the Local Preference depending on AS path

!
ip as-path access-list 4 permit _30088_
ip as-path access-list 4 deny .*
!
route-map ispa-in permit 10
 set local-preference 90
!
route-map ispb-in permit 10
 match as-path 4
 set local-preference 80
!
route-map ispb-in permit 20
 set local-preference 110
!


Prepending the AS path

!
ip as-path access-list 4 permit _30088_
ip as-path access-list 4 deny .*
!
route-map ispa-in permit 10
 set as-path prepend 60055
!
route-map ispb-in permit 10
 match as-path 4
 set as-path prepend 60055 60055 60055
!
route-map ispb-in permit 20
!


Using communities to help select the best route

!
router bgp 60055
 bgp always-compare-med
!
ip bgp-community new-format
ip community-list 1 permit 50066:3001
ip community-list 1 deny
ip community-list 2 permit 50066:3002
ip community-list 2 deny
!
route-map ispa-in permit 10
 set metric 10
!
route-map ispb-in permit 10
 match community 1
 set metric 10
 set local-preference 120
!
route-map ispb-in permit 20
 match community 2
 set metric 20
!
route-map ispb-in permit 30
 set metric 10
!


BGP Load Balancing

!
router bgp 60055
 maximum-paths 4
!